Northern Airborne Technology ACP53-001 - Manual (Page 28)

ACP53-001 DACS Audio Control Panel
SM75 Installation and Operation Manual
Section 3 Rev: 1.00 Issue 1 Page 3-7
ENG-FORM: 806-0113.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
The ACP53 has a dead-front CALL indicator that flashes to signify that another user is
calling when the system is in ISO mode.
3.4.12 ISO Indicator
ISO
3.4.13 CALL Indicator
CALL
The CALL Indicator will flash once per second for a Normal call and at 3 times per second for a High
Priority call.
3.4.13.1 Call Priority
In ISO mode, a passenger may use the ISO/CALL button on their ACP53 (or an external remote switch)
to contact the crew.
The ISO/CALL button on each passenger ACP53 can be designated either a Normal Call, High Priority
Call, or Isolation Override at installation. Any remote switch will be wired to have a preset priority status.
If the switch is designated a Normal or High Priority call, a call will be indicated in the crew unit(s) along
with a call tone in all users phones. The crew can then cancel ISO mode to acknowledge the call; or if the
call is not answered it can either continue, or be set at installation to time out.
If the ISO/CALL button is designated with an Isolation Override functionality, the Isolation Mode is
temporarily suspended and the passengers can communicate with the crew members.
3.4.14 Transmit Features
Note: Confirm the specific criteria associated with this installation with your installing agency.
Various features may be configured through the audio management unit during installation. Typical
examples are given below.
3.4.14.1 User Priority
The DACS is designed so that if a user has keyed a specific transceiver, no other user can access that
transceiver for the duration of the transmission.
3.4.14.2 Transmit Time-Out
The DACS has a stuck microphone (transmit key-line shorted to ground) timeout feature. After thirty to
one hundred and twenty seconds (adjustable at installation), the transmit key input signal is overridden,
the selected radio will stop transmitting, and the transmit indicator on the user’s Audio Control Panel will
no longer be displayed. The timer is reset once the transmit key-line is no longer grounded.
At installation, this feature may be disabled.
Section 3 ends
The ACP53 has a dead-front ISO indicator that will illuminate when Isolation mode has been
selected.